Well if BoA is committed to a Japanese comeback she will NEED and I mean NEED either a commercial or a drama tie-in for this single and appear in magazines and TV programs.
If the single doesn't get any extensive promotions no one will care. The last BoA "hit" in Japan was White Wishes and, for such a basic ass but pretty song, it became successful because of the game-tie in. Without that tie-in it would've went down the road of VIVID.
I have low expectations, as usual. I'm not here for K-pop BoA, I'm here for J-pop BoA.
P.S. BoA cannot compare to Namie Amuro or Ayumi Hamasaki. BoA is around the same level as Koda Kumi though. But as of this day Koda Kumi has more success than BoA in Japan.